I have a never used CMMG M4 gas upper w/ chrome line barrel 14.7 barrel w/ pinned bird cage flash = 16inch overal length. !!!100% CA legal!!! w/ M16 bolt and carrier all complete upper for only $650.00. please email me at waltershumate1111@yahoo.com. I may able to deliver it any were along I-5 from redding to near LA and along I-10 from around LA to AZ border. I must sell this upper!!! for no less then what i paid for it at $650.00. Thank you for your time.